Try accessing below Joomla Administrator URL.
https://joomer.com.in/demo/administrator
Once you click on the above Joomla Administrator URL, you would be redirected to Homepage instead of Joomla Admin since the Demo Admin is protected by Secure Admin Extension.
With Secure Admin installed, you can access your website's Joomla Administrator by appending a key to Joomla Administrator URL which you can set from Secure Admin Extension in below format.
www.website.com/administrator?key
By using the above format you would be able to access Joomla Administrator with ease and your Joomla Administrator is completely Safe from Hackers and Malicious Users / Scripts.